The power to observe at least 4 of 6 patients in the target range increased from 33% using fixed dosing with tablets to 80% using pharmacokinetically guided with capsules. The expected HFSR toxicity rate decreased from 22% using fixed doses with tablets to 16% using pharmacokinetically guided dosing with capsules. The power to observe less than 6 of 24 studies with HFSR toxicity increased from 51% using fixed dosing with tablets to 88% using pharmacokinetically guided with capsules. Our simulations provide the rationale to use pharmacokinetically guided sorafenib dosing to maintain effective exposures that potentially improve tolerability in pediatric clinical trials.Factor XII (FXII) is a serine protease that participates in the intrinsic coagulation pathway. Several studies have shown that plasma FXII exerts a deleterious role in cerebral ischemia and traumatic brain injury by promoting thrombo-inflammation. Nevertheless, the impact of FXII on neuronal cell fate remains unknown.
We investigated the role of FXII and FXIIa in neuronal injury and apoptotic cell death.
We tested the neuroprotective roles of FXII and FXIIa in an experimental model of neuronal injury induced by stereotaxic intracerebral injection of N-methyl-D-aspartic acid (NMDA) in vivo and in a model of apoptotic death of murine primary neuronal cultures through serum deprivation in vitro.
Here, we found that exogenous FXII and FXIIa reduce brain lesions induced by NMDA injection in vivo. Furthermore, FXII protects cultured neurons from apoptosis through a growth factor--like effect. This mechanism was triggered by direct interaction with epidermal growth factor (EGF) receptor and subsequent activation of this receptor. Interestingly, the "proteolytically" active and two-chain form of FXII, FXIIa, exerts its protective effects by an alternative signaling pathway. FXIIa activates the pro-form of hepatocyte growth factor (HGF) into HGF, which in turn activated the HGF receptor (HGFR) pathway.
This study describes two novel mechanisms of action of FXII and identifies neurons as target cells for the protective effects of single and two-chain forms of FXII. Therefore, inhibition of FXII in neurological disorders may have deleterious effects by preventing its beneficial effects on neuronal survival.
This study describes two novel mechanisms of action of FXII and identifies neurons as target cells for the protective effects of single and two-chain forms of FXII. Therefore, inhibition of FXII in neurological disorders may have deleterious effects by preventing its beneficial effects on neuronal survival.In this issue of FEBS Open Bio, Shen Li et al., in the laboratory of Hector L. Franco (University of North Carolina), provide a proof-of-principle solution for correcting all copies of a gene in the widely used MCF7 breast cancer cell line. The gene for the FOXA1 pioneer transcription factor is localised on chromosome 14, which is present at least 4-5 times in MCF7 cells. To achieve their goal, the authors used a 'classical' version of the CRISPR/Cas9 system. Both sgRNA and Cas9 components were expressed from a single vector, which also has a puromycin resistance cassette; this is an essential module for the chosen strategy, because it ensures expression of both sgRNA and Cas9 in selected cells. https://www.selleckchem.com/screening/kinase-inhibitor-library.html A targeting template in the form of nonlinearised plasmid was shown to have the best efficiency and was used to introduce a substitution at position 295 in the gene encoding FOXA1 to change a codon encoding lysine into a codon encoding glutamine (K295Q). The strategy suggested by Li and co-authors is an important development towards genome editing of multiple copy genes in a polyploid environment like cancer cells. One important application of the technique could be in creating models to study the role of single nucleotide polymorphisms in cancer progression and metastasis. Isogenic cancer lines carrying polymorphic variants of key drug targets could be used to optimise anticancer treatment protocols, laying a foundation for personalised therapy.The assessment of muscle mass is a key determinant of the diagnosis of sarcopenia. We introduce for the first time an ultrasound imaging method for diagnosing sarcopenia based on changes in muscle geometric proportions.
Vastus lateralis muscle fascicle length (Lf) and thickness (Tm) were measured at 35% distal femur length by ultrasonography in a population of 279 individuals classified as moderately active elderly (MAE), sedentary elderly (SE) (n=109), mobility impaired elderly (MIE) (n=43), and in adult young controls (YC) (n=60). The ratio of Lf/Tm was calculated to obtain an ultrasound index of the loss of muscle mass associated with sarcopenia (USI). In a subsample of elderly male individuals (n=76) in which corresponding DXA measurements were available (MAE, n=52 and SE, n=24), DXA-derived skeletal muscle index (SMI, appendicular limb mass/height) was compared with corresponding USI values.
For both young and older participants, USI values were found to be independent of sex, height and body maical tool for confirming the diagnosis of sarcopenia, of which the assessment of muscle mass is a key-component.The importance of support to breastfeeding success is well established, as are the difficulties many mothers face in accessing the support they need. With the majority of UK mothers now accessing social media for support, Breastfeeding Support Facebook (BSF) groups have increased exponentially. BSF groups vary in type (local or national/international) and in moderation-overseen by breastfeeding mothers and by midwives or trained lactation specialists. Some groups aimed at supporting mothers in a specific geographical area also have associated face-to-face groups, facilitated as either professional or peer support. Little is currently known about these specific local groups, their prevalence, impact or value to mothers. This paper examines mothers' experiences of using local BSF groups and why they value them as part of a larger study exploring the impact of midwife moderation on these groups. An online survey consisting of open and closed questions was completed by 2028 mothers. Findings identified that local BSF groups are widely used and highly valued for their connection with local face-to-face services and other mothers.